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Universal Punch Concentricity Gaging SystemG1 Series · -20Side Carrier
G1-20 Side Checker Concentricity Gage
Side Carrier measurement access for 3/8–2 in (10–50 mm) cylindrical parts.
The Universal Punch G1-20 is a -20 size-class Side Checker Gage
configured with a Side Carrier for inspection applications that require lateral indicator access to the supported component.
Published capacity is 3/8–2 in (10–50 mm) diameter with part lengths up to 6 in (152 mm).
G1-20 · Side Checker Gage · Side Carrier. The -20 platform is the 10–50 mm size class.
Part Diameter3/8–2 in10–50 mm
Part LengthUp to 6 in152 mm
CarrierSide CarrierDefining G1 architecture
Shipping Weight6.4 lb2.9 kg
G1-20 Product Definition
The medium-size Side Carrier configuration in the G1 family.
The G1 family uses a common inspection architecture: Side Checker Gage + Side Carrier. The -20 suffix identifies the 10–50 mm size class.
G1-20 at a glance
The Universal Punch G1-20 is a -20 Side Checker concentricity gage with a Side Carrier for cylindrical parts from 3/8–2 in (10–50 mm) in diameter and part lengths up to 6 in (152 mm). The final system is configured around the part print, roller support geometry, indicator access, accuracy and rotation method.
Best-fit rule: start with G1-20 when the part fits the -20 size class and the inspection feature is best reached from the side.
G1-20 side-access architecture. G1 uses a Side Carrier; the corresponding G2 family uses a Vertical Carrier.
Side Carrier Architecture
Position the indicator where the inspection feature requires it.
The Side Carrier provides lateral indicator positioning. Final probe direction, stylus, contact point, carrier location and range should be selected from the component drawing and actual measurement requirement.
01
Review the part print
Identify the feature, datum relationship, tolerance and intended inspection method.
02
Identify repeatable support lands
Select cylindrical surfaces that can support stable rotational inspection.
03
Confirm Side Carrier access
Configure lateral access around stylus reach, angle, indicator range and resolution.
Selection principle: choose G1-20 from the measurement location and support geometry—not from diameter alone.
Published G1-20 Specifications
A clear technical reference for the -20 Side Carrier platform.
G1-20 platform. Published capacity and physical data are shown at right.
Model
G1-20
Gage Type
Side Checker Gage
Carrier
Side Carrier
Part Diameter
3/8–2 in / 10–50 mm
Part Length
Up to 6 in / 152 mm
General-Data Part-Length Range
Approx. 0.18–6 in / 4.7–152 mm
Gage Length
12.5 in / 318 mm
Gage Width
4.5 in / 114 mm
Gage Height
Approx. 6 in / 152 mm
Shipping Weight
6.4 lb / 2.9 kg
Fit note: published capacity is only the starting point. Final fit depends on support lands, adjacent geometry, roller selection, indicator access and the inspection requirement.
-20 Roller Selection
Select support geometry from the actual component.
Current Universal Punch parts documentation publishes three primary main-roller styles for the -20 model class. Final selection depends on the support lands, clearances and measurement feature.
Standard -20 Top Roller170-203/4 × 9/32 in · approx. 19 × 7 mm
Full Plain Roller Set120-20FP
Half Plain Roller Set120-20HP
Quarter Plain Roller Set120-20QP
Engineering note: final roller and top-contact selection should be based on the actual support lands, clearance and inspection feature—not nominal diameter alone.
Accuracy, Indicators & Calibration
Configure the complete measurement system—not only the base gage.
Standard Black
≤4 µm0.00016 in published accuracy classification
Current Universal Punch parts documentation identifies Standard Black at ≤4 µm and describes the calibration as directly traceable to NIST.
≤2 µm0.000079 in · published for applicable -10 / -20 model classes
Because G1-20 is a -20 model, it is within the published Precision Gold size class. Final G1-20 configuration, indicator resolution and calibration package should be confirmed when ordering.
Indicator configuration
Current parts documentation includes analog and digital test indicators, inch and metric graduations, mounts, swivel supports and data-capable options. Specify the indicator from the required range, resolution, stylus reach, mounting direction and calibration documentation.
Optional Powered Rotation
A dedicated G1-20 variable-speed motor assembly is currently published.
Current Universal Punch parts documentation lists a G1-20 Variable Speed Motor Assembly with a 17 in / 432 mm base plate. The current drive-system section identifies 24 VDC / 0–10 rpm, forward/reverse control and 110/220 VAC transformer support.
Manufacturer-controlled model data, components and application support.
Universal Punch can specify the G1-20 as a complete measurement system because the model, roller sets, top rollers, indicators, mounts, accuracy classes and motorized options are documented within the same manufacturer-controlled product system. The final configuration should be reviewed against the actual part print.
Current Model SelectionG1-20 · Side Checker Gage · Side Carrier
Published for the 10–50 mm / 3/8–2 in size class.
Current -20 Roller System120-20FP · 120-20HP · 120-20QP
Full Plain, Half Plain and Quarter Plain main-roller sets.
Published Standard Top Roller170-20 · 3/4 × 9/32 in
Approximately 19 × 7 mm.
Published AccuracyStandard Black ≤4 µm · Precision Gold ≤2 µm
Precision Gold is published for applicable -10 / -20 size classes; confirm final G1-20 configuration.
Current Motorized OptionG1-20 Variable Speed Motor Assembly
17 in / 432 mm base plate with current 24 VDC / 0–10 rpm architecture.
G1-20 Technical FAQ
Direct answers for engineers, inspectors and buyers evaluating the G1-20.
The G1-20 is a -20 Side Checker concentricity gage with a Side Carrier for cylindrical parts from 3/8–2 in (10–50 mm) in diameter and part lengths up to 6 in (152 mm).
Start with the G1-20 when the part fits the 3/8–2 in (10–50 mm) diameter class, the part length is within the published 6 in (152 mm) maximum, usable cylindrical support lands are available, and the inspection feature benefits from lateral Side Carrier indicator access.
Its defining architecture is the Side Carrier. G1 models provide lateral indicator access, while the corresponding G2 family uses a Vertical Carrier.
Published diameter capacity is 3/8–2 in (10–50 mm). Customer-facing literature states part lengths up to 6 in (152 mm), while current general-data literature also publishes an approximate minimum part length of 0.18 in (4.7 mm).
Universal Punch publishes 6.4 lb (2.9 kg).
Current G1/G2-20 general-data literature lists 12.5 in (318 mm) length, 4.5 in (114 mm) width and approximately 6 in (152 mm) height.
Both are -20 Side Checker gages in the 10–50 mm class. G1-20 uses a Side Carrier, while G2-20 uses a Vertical Carrier.
Current Universal Punch parts documentation identifies Full Plain 120-20FP, Half Plain 120-20HP and Quarter Plain 120-20QP main roller sets for -20 models.
Universal Punch identifies the 170-20 top roller, 3/4 x 9/32 in (approximately 19 x 7 mm), as the standard -20 top roller.
Universal Punch publishes Precision Gold for applicable -10 and -20 model classes at ≤2 µm (0.000079 in). Because G1-20 is a -20 model, it is within the published size class, but final configuration, indicator resolution and calibration requirements should be confirmed when ordering.
Current Universal Punch parts documentation identifies Standard Black at ≤4 µm (0.00016 in), with calibration directly traceable to NIST.
Yes. Current Universal Punch parts documentation lists analog and digital test indicators along with multiple mounts and carrier accessories. Final range, resolution, stylus and mounting should match the inspection requirement.
Yes. Current Universal Punch parts documentation lists a G1-20 Variable Speed Motor Assembly with a 17 in (432 mm) base plate.
The current variable-speed motorized system is documented at 24 VDC with a 0–10 rpm range and forward/reverse control.
Send the part drawing, diameter, overall length, usable cylindrical support surfaces, feature being measured, measurement direction, tolerance, preferred indicator or readout, required resolution, accuracy and calibration requirements, and whether manual or motorized rotation is preferred.
Configure the G1-20 Around the Actual Component
The print—not the product photograph—determines the final configuration.
Send Universal Punch the part drawing, diameter, overall length, usable support surfaces, measurement feature, direction, tolerance, preferred analog or digital readout, required resolution, accuracy/calibration requirement and manual or motorized rotation preference.
